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Texas Instruments LM46001AQPWPTQ1
- Part No.:
- LM46001AQPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46001AQPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:504
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Product details
Overview
LM46001AQPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC-DC converter delivering up to 1 A output current across a 3.5 V to 60 V input range, featuring 24 µA quiescent current in regulation, adjustable switching frequency (200 kHz–2.2 MHz), and integrated power-good flag. It serves as the primary voltage regulator in automotive sub-AM band power supplies, driving critical ECUs requiring high efficiency and EMI-compliant operation.
For engineers reviewing the LM46001AQPWPTQ1 datasheet, LM46001AQPWPTQ1 pinout, LM46001AQPWPTQ1 application, or LM46001AQPWPTQ1 equivalent, key selection considerations include its PFM-optimized light-load efficiency, EN-controlled precision UVLO (2.1 V threshold), internal soft-start (4.1 ms), and EN55022 Class B radiated emissions compliance verified on evaluation board.
Technical Context
The LM46001AQPWPTQ1 employs peak current mode control with automatic transition between PWM, DCM, and PFM modes to maintain high efficiency across 0–1 A load range. Its internal compensation eliminates external loop components, while programmable RT-based frequency tuning and SYNC input enable system-level clock alignment without compromising stability.
It integrates dual MOSFETs (RDS(on)-HS = 419 mΩ, RDS(on)-LS = 231 mΩ), a precision 1.016 V feedback reference (±1.5% over –40°C to +125°C), and hiccup-mode short-circuit protection triggered at 2.45 A peak inductor current - all within a thermally enhanced HTSSOP-16 package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports direct battery connection in 12 V/24 V/36 V automotive systems without pre-regulation |
| Output Current | Up to 1 A continuous - sufficient for microcontroller cores, CAN transceivers, and sensor signal chains |
| Quiescent Current | 24 µA in regulation - enables always-on functionality in low-power vehicle modules |
| Switching Frequency | 200 kHz to 2.2 MHz (default 500 kHz) - allows optimization for EMI filtering size vs. efficiency trade-off |
| Feedback Reference | 1.016 V ±1.5% - enables accurate output setting from 1 V to 28 V using standard resistor dividers |
| EMI Compliance | Tested to EN55022/CISPR 22 Class B radiated limits - reduces need for external EMI filters in automotive layouts |
| Thermal Shutdown | 160°C junction trip, 150°C recovery - protects against sustained overload in enclosed enclosures |
Pinout & Package
The LM46001AQPWPTQ1 is housed in a 16-pin HTSSOP (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm with 0.65-mm lead pitch and an exposed thermal pad (PAD) connected internally to AGND for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching current - requires shortest possible trace to minimize EMI and voltage spikes |
| CBOOT (3) | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470 nF ceramic capacitor tied to SW |
| VCC (4) | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; no external load permitted |
| BIAS (5) | Optional LDO input | Tie to VOUT (if 3.3 V ≤ VOUT ≤ 28 V) or external 3.3/5 V rail to reduce VIN current draw and improve efficiency |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; must be terminated to prevent ringing |
| RT (7) | Frequency programming | Resistor to AGND sets frequency; open circuit defaults to 500 kHz |
| PGOOD (8) | Open-drain power-good flag | Asserts after VOUT reaches 90% of target; requires 10–100 kΩ pull-up to logic rail ≤12 V |
| FB (9) | Feedback sense input | Monitors resistive divider midpoint; 1.016 V reference enables precise output regulation |
| AGND (10) | Analog ground reference | Separate from PGND; connects to system ground and bypass capacitors for noise-sensitive analog circuits |
| SS/TRK (11) | Soft-start/tracking control | Open for internal 4.1 ms soft-start; add capacitor to extend ramp time or connect external ramp for voltage tracking |
| EN (12) | Enable input | Logic-high (>2.1 V) enables regulation; precision threshold allows system-level UVLO implementation |
| VIN (13,14) | Main power input | Dual pins reduce IR drop and thermal stress; connect directly to CIN with minimal loop area to PGND |
| PGND (15,16) | Power ground return | Low-impedance path for high-side/low-side FET currents; tie to PAD, AGND, and CIN/COUT grounds |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to large copper pour for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| PFM-optimized operation | Delivers >85% efficiency at 10 mA load (VIN = 24 V, VOUT = 3.3 V), extending battery life in sleep-mode automotive modules |
| Internal compensation | Eliminates external Type II/III compensation network - reduces BOM count and layout sensitivity |
| Pre-biased soft-start | Enables safe startup into powered rails without output voltage overshoot or reverse current flow |
| Output voltage tracking | SS/TRK pin accepts external ramp to coordinate power sequencing with other regulators in multi-rail systems |
| Short-circuit hiccup mode | Limits average power during fault by cycling ON/OFF (5.5 ms retry delay), preventing thermal runaway under sustained overload |
| Stable with diverse capacitors | Supports ceramic, polymer, tantalum, and aluminum output caps - simplifies sourcing and mitigates aging concerns |
Applications
| Automotive Body Control Module (BCM) | Telematics Control Unit (TCU) |
|---|---|
Use Scenario: Regulating 12 V battery to 3.3 V for MCU, CAN FD transceiver, and LIN interface in door module. IC Role / Device Role / Timing Role: Primary buck converter supplying core logic voltage with PFM efficiency during vehicle sleep mode. Use Value: 24 µA quiescent current ensures <100 µA total system standby draw, meeting OEM SAE J1939 low-power requirements. | Use Scenario: Powering GPS receiver, cellular modem, and eCall processor from 24 V commercial vehicle battery. IC Role / Device Role / Timing Role: Wide-VIN point-of-load regulator enabling single-board design across 12 V/24 V fleets. Use Value: 3.5–60 V input range avoids need for separate 12 V/24 V SKUs; EN55022 Class B compliance eliminates external EMI filter cost. |
| Commercial Vehicle ADAS Camera ECU | Railway Onboard Communication Gateway |
Use Scenario: Generating 5 V for image sensor and 1.2 V for FPGA core from unstable 24 V rail subject to load dump transients. IC Role / Device Role / Timing Role: Input-stage buck converter feeding secondary LDOs; handles 60 V transients without shutdown. Use Value: 60 V absolute max input rating and hiccup-mode protection ensure uninterrupted operation during ISO 7637-2 pulse 5a/b events. | Use Scenario: Converting 72 V nominal railway supply (range 40–160 V) to 5 V for Ethernet PHY and ARM Cortex-A53 SoC. IC Role / Device Role / Timing Role: Pre-regulator stepping down high-voltage rail before downstream converters. Use Value: Adjustable 200 kHz–2.2 MHz switching allows lower frequency operation to reduce core losses at high input voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46002AQPWPTQ1 | 2 A output current, identical pinout and feature set; higher RDS(on) (HS: 240 mΩ, LS: 130 mΩ) but same thermal footprint | Suitable where future-proofing for higher load or parallel operation is required; shares same PCB layout | Select when >1 A peak load or margin for derating is needed without redesigning layout |
| TPS54360BQPWPRQ1 | 3.5–60 V input, 3.5 A output; external compensation; no integrated PFM mode; higher IQ (14 µA shutdown, 60 µA operating) | Better suited for high-current, fixed-frequency designs requiring custom loop response; lacks PGOOD and tracking | Choose for applications needing >1 A or custom compensation, accepting higher BOM count and reduced light-load efficiency |
Compared with LM46002AQPWPTQ1, the LM46001AQPWPTQ1 offers lower conduction loss at light loads and smaller solution size; versus TPS54360BQPWPRQ1, it delivers superior light-load efficiency and integrated features at the cost of lower current capability and non-adjustable compensation.
Availability
LM46001AQPWPTQ1 is available at Aetrix Electronics and suitable for automotive body electronics, telematics systems, and commercial vehicle power supplies requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LM46001AQPWPTQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade power management ICs.
The LM46001-Q1 family was designed specifically for demanding automotive power conversion applications - emphasizing wide input range, low quiescent current, EMI robustness, and AEC-Q100 reliability across temperature extremes.
FAQ
What is the maximum input voltage rating for the LM46001AQPWPTQ1?
The LM46001AQPWPTQ1 has an absolute maximum input voltage rating of 65 V across VIN to PGND, with recommended operation up to 60 V. This enables direct connection to 24 V and 36 V automotive batteries including load dump transients per ISO 7637-2, ensuring reliable operation without external clamping in most vehicle architectures. The device remains functional and protected within this range when used with proper input capacitance and layout.
Does the LM46001AQPWPTQ1 support output voltage tracking?
Yes, the LM46001AQPWPTQ1 supports output voltage tracking via the SS/TRK pin. When an external voltage ramp is applied to this pin, the output follows that ramp with unity gain, enabling coordinated power-up sequencing with other regulators in multi-rail systems such as ADAS domain controllers. This function operates independently of the internal soft-start timer and is confirmed in the device's functional description and timing specifications.
How does the LM46001AQPWPTQ1 achieve EN55022 Class B compliance?
The LM46001AQPWPTQ1 achieves EN55022 Class B radiated emissions compliance through optimized internal gate drive timing, integrated bootstrap circuitry, and careful pin placement in the HTSSOP-16 package - validated using the LM46001QPWPEVM evaluation board without additional EMI filters. Measured data shows peak emissions remain below the quasi-peak limit across 30–1000 MHz, fulfilling automotive EMC requirements for subsystem integration.
What is the purpose of the BIAS pin on the LM46001AQPWPTQ1?
The BIAS pin on the LM46001AQPWPTQ1 provides an optional input to the internal LDO, improving conversion efficiency when tied to VOUT (for 3.3 V ≤ VOUT ≤ 28 V) or an external 3.3 V/5 V rail. Doing so reduces current drawn from VIN, lowering total system power dissipation - particularly beneficial in thermally constrained automotive modules. If unused (e.g., VOUT < 3.3 V), the pin must be tied to ground; floating is prohibited.
Can the LM46001AQPWPTQ1 operate with ceramic output capacitors only?
Yes, the LM46001AQPWPTQ1 is explicitly characterized and stabilized with ceramic output capacitors, including low-ESR types. Its internal compensation and peak current mode architecture eliminate the need for minimum ESR requirements, allowing full compatibility with X5R/X7R MLCCs - reducing solution size, cost, and aging-related drift compared to polymer or tantalum alternatives.
LM46001AQPWPTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM46001AQPWPTQ1 FAQ
1.How can I place an order for LM46001AQPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46001AQPWPTQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM46001AQPWPTQ1 reliable?
The price and inventory of LM46001AQPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46001AQPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM46001AQPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46001AQPWPTQ1 transactions.
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4.How is shipping managed for LM46001AQPWPTQ1?
LM46001AQPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46001AQPWPTQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM46001AQPWPTQ1?
For technical support, including LM46001AQPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46001AQPWPTQ1 requirements.
6.How does Aetrix verify that LM46001AQPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM46001AQPWPTQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM46001AQPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM46001AQPWPTQ1?
All LM46001AQPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46001AQPWPTQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM46001AQPWPTQ1 part is unused and in its original packaging.
Return procedure for LM46001AQPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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